Why did the energy crisis of the 1970s renew interest in coal-fired MHD systems?

The energy crisis of the 1970s renewed interest in coal-fired magnetohydrodynamic (MHD) systems primarily due to the global need for more efficient and secure energy production methods in the face of escalating energy issues and supply instability.12

Coal-fired MHD systems were particularly attractive for several reasons:

• Efficiency: By utilizing a binary cycle—where an MHD generator acts as a "topping" unit before a conventional steam plant—these systems offered the potential for significantly higher thermal efficiency (60 to 65 percent) compared to conventional power plants (35 to 40 percent).34
• Resource Abundance: The widespread availability of coal reserves made it a strategic fuel choice for enhancing energy independence.4
• Environmental Benefits: Despite using coal, these systems were designed to produce fewer pollutants. The combustion process allowed for the reduction of sulfur dioxide emissions through the formation of potassium sulfate, and careful boiler design helped minimize nitrogen oxide emissions.34

While research intensified during this period, the high construction costs and economic risks associated with the technology ultimately limited its widespread adoption by electric power utilities.31